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The Strength of Continuous Gradation is Larger Than That of Single Gradation

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  • Research Article - Hydrology
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Effect of gradation variation on particle transport process in a generalized flash flood gully via CFD-DEM method

Acta Geophysica (2022)Cite this article

Abstract

Understanding the particle dynamics in flash flood gullies can help us learn how particle systems work and how river landscapes evolve. While discrete particle-based simulation techniques can accurately capture the transient forces acting on individual particles and their movement trajectories, they also suffer from the problem of excessive computation. To assess the feasibility of applying simplified discrete particle simulation techniques, this paper examines the mechanics of particle transport with loose accumulation in a generalized main and branch gully with a right angle under three different particle gradations using a coupled computational fluid dynamics and discrete element method (CFD-DEM). Numerical results indicate that the accumulation formed by the single gradation particles sliding into the main gully has the greatest degree of encroachment on the gully space and influences the lifting of the water depth of the cross section the most, and its velocity peaks at the fastest speed after being swept away by the water flow. Comparing the cumulative mass and the particle transport rate of the main gully, this paper reveals the similarity in the particle transport process. Based on the number of particle gradation (\(n\)), the transport process of all particle gradations can be mutually converted using the time transformation scale \(\frac{n + 1}{n}\). This method can effectively unify the transport process of particles with different gradations. Given the result of the work presented in this paper, it can be taken as a reference for simplifying the calculation of particle transport simulation based on particles in flash flood gullies.

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Acknowledgements

The study is supported by the National Natural Science Foundation of China (Grant No. 51639007).

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Authors and Affiliations

  1. State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, 610065, China

    Yi-pin Nie, Ling Lan, Xu-feng Yan & Xie-kang Wang

Corresponding author

Correspondence to Xie-kang Wang.

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The authors declare no conflict of interest.

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Edited by Prof. Subhasish Dey (ASSOCIATE EDITOR) / Dr. Michael Nones (CO-EDITOR-IN-CHIEF).

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Nie, Yp., Lan, L., Yan, Xf. et al. Effect of gradation variation on particle transport process in a generalized flash flood gully via CFD-DEM method. Acta Geophys. (2022). https://doi.org/10.1007/s11600-022-00862-z

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  • DOI : https://doi.org/10.1007/s11600-022-00862-z

Keywords

  • Particle transport process
  • CFD-DEM method
  • Gradation variation
  • Generalized flash flood gully
  • Time transform scale

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